RAPID: A Community Test of Distributed Acoustic Sensing on the Ocean Observatories Initiative Regional Cabled Array

RAPID：海洋观测站倡议区域有线阵列分布式声学传感的社区测试

基本信息

批准号：
2141047
负责人：
William Wilcock
金额：
$ 13.25万
依托单位：
University of Washington
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2141047&HistoricalAwards=false
关键词：
RAPID Community Test Distributed Acoustic

项目摘要

In recent years, there has been interest in the potential of offshore distributed acoustic sensing (DAS) in the Pacific Northwest and a test in this region would be of widespread interest to the oceanographic community. DAS is a relatively new observational technique in academia that interrogates an optical fiber with repeated laser pulses and utilizes changes in the phase of backscattered light to measure the strain rate along the fiber. DAS can work to distances of up to ~100 km, has a spatial resolution of a few meters and a broad frequency sensitivity. There is still a lot to be learned about how the DAS signal responds to strain. On land, DAS has been demonstrated for a wide variety of applications including earthquake monitoring and rapid response aftershock studies etc. DAS experiments in the ocean are more challenging. It wasn’t until 2019 that the potential of seafloor DAS for academic research was demonstrated. The Oregon margin is one of the most energetic coastlines in the world and an excellent location to test the DAS capabilities and is thus, an ideal site to study the role of storms in generating seismic noise near coastlines and potentially understanding if and how DAS could be used for measuring sediment exchange. DAS has also been identified as a new technology that might form an important component of future offshore earthquake and tsunami early warning systems in Cascadia and elsewhere. The scheduled shutdown provides a great opportunity to test DAS in this region. A Caltech graduate student will get experience leading data acquisition and two UW graduate students will gain experience in DAS/DTS data acquisition. The PIs are taking advantage of a rare scheduled shutdown in early November 2021 of the Ocean Observatories Initiative (OOI) Regional Cabled Array (RCA). With the RCA cables disconnected from all RCA shoreside equipment, the distributed acoustic sensing (DAS) and distributed temperature sensing (DTS) systems will be connected to the OOI fibers and will undergo testing to determine the potential of submarine DAS to observe seismic, oceanographic, acoustic and geodetic processes. DAS is potentially of great importance for efforts to develop offshore earthquake and tsunami warning systems in Cascadia and this experiment represents an important step in developing protocols that can support the use of DAS for science and hazards mitigation in the Northeast Pacific while meeting national security requirements.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

近年来，人们对西北太平洋地区的海上分布声感应（DAS）的潜力感兴趣，并且该地区的测试对海洋学社区的兴趣很大。 DAS是学术界的一种相对新的观察技术，它询问具有重复激光脉冲的光纤，并利用反向散射光阶段的变化来测量沿纤维的应变速率。 DAS可以达到高达〜100 km的距离，具有几米的空间分辨率和较大的频率灵敏度。关于DAS信号对应变的反应如何，仍然有很多了解。在陆地上，已经证明了DAS用于多种应用，包括地震监测和快速反应后的余震研究等。海洋中的DAS实验更具挑战性。直到2019年，海底DAS的潜力才得以进行学术研究。俄勒冈边缘是世界上最有活力的海岸线之一，也是测试DAS能力的绝佳地理位置，因此，是研究风暴在海岸线附近产生地震噪声的作用的理想场所，并有可能了解以及如何使用DAS来测量沉积物交换。 DAS还被确定为一种新技术，它可能构成卡斯卡迪亚和其他地方的未来海上地震和海啸预警系统的重要组成部分。预定的关闭提供了一个很好的机会来测试该地区的DAS。 CALTECH研究生将获得领先的数据获取经验，两名UW研究生将获得DAS/DTS数据获取的经验。 PI在2021年11月初的海洋天文台计划（OOI）区域有线阵列（RCA）中利用了罕见的计划关闭。随着RCA电缆与所有RCA Shoreside设备断开连接，分布式声感应（DAS）和分布式温度传感（DTS）系统将连接到OOI纤维，并将进行测试以确定das潜能，以观察地震，大洋学，声学，声学和地球过程。 DAS对于在卡斯卡迪亚开发近海地震和海啸警告系统的努力非常重要，该实验代表了开发协议的重要一步，可以支持在东北太平洋中使用DAS来缓解科学和危害，同时满足国家安全要求，这反映了NSF的法定任务和审查的范围，这表明了众多的范围，这是由众多的依据来评估的。